Device for cutting pipes



(No Model.)

0. M. OARNAHAN.

DEVICE FOR CUTTING PIPES.

Nq. 414.,287. Patented Nov. 5, 1889.

UNITED STATES PATENT OFFICE.

CYRUS M. (ARNAHAN, OF PITTSBURG, ASSIGNOR OF ONE-HALF TO WILLIAM M. ORR, OF ALLEGHENY, PENNSYLVANIA.

DEVICE FOR CUTTING PIPES.

SPECIFICATION forming part of Letters Patent No. 414,287, dated November 5, 1889.

Application filed October 16, 1886. Renewed February 28, 1889. Serial No. 301,581. (No model.)

To all whom it may concern.- bed-die of the two parts a and l) is that they Be it known that I, CYRUS M. CARNAHAN, may be adjusted toward and from each of Pittsburg, in the county of Allegheny and other. This is desirable, but is not neces- State of Pennsylvania, have invented a new sary, since, if desired,'the whole die may be and useful Improvement in Machines for Cutintegral in one piece with the slot 0 formed 55 ting Pipes; and I do hereby declare the foltherein. The surface of the die at the sides lowing to be a full, clear, and exact descripof the slot 0 is made concave, and is of the tion thereof. proper shape to receive the pipe to be cut,

The object of my invention is to provide which rests therein, as shown in Figs. 2 and improved means for cutting pipes with a sav- 3. The angle of the slot 0 with the line of 60 ing of time and with simpler machinery as the concavity conforms to the angle at which compared with the methods and means herethe pipe is to be cut. Thus if it is desired tofore used. to cut the pipe directly across the bed-dies My improvement comprises the use of manare shaped and set so that the slot 0 shall drels, which are adapted to be inserted into cross the pipe concavity at right angles, and 65 the pipe, and'are separated from each other in the case shown in Figs. 2 and 3, where the at their ends, together with a knife, which is tools are adapted to make an angling cut, arranged to cut through the pipe and through the slot 0 is made at an acute angle with the the space between the mandrels, which durconcavity extending across it.

ing the cutting act as supports for the pipe, (I is the moving cutter, which is mounted 70 and as bed-knives they coact with the movat the end of a vertically-reciprocating pluning knife. ger 6, directly over the slot 0, and the knife is It also consists in the combination, with set at the same angle as the slot, so that it these elements, of bed knives or dies which shall enter the same in its reciprocations.

support the under side of the pipe and act f and f are mandrels which are inserted 75 with the moving knife in shearing it. within the pipe before it is out. These are It also consists in peculiar constructions of shown in Fig. 1. Each OODSIStS Of a metal the bed-die and the moving knife. bar or rod preferably of about the same di- In the accompanying drawings, Figure 1 is ameter as the bore of the pipe. The inner a plan view of the apparatus as it is when ends of the mandrels are of substantially the 80 cutting a pipe. Fig. 2 is a side View of the same form as the cutting-edges of the bedapparatus. Fig. 3 is a vertical section on the dies a and Z), so that when the mandrels are line as a: of Fig. 2. Fig. at is a bottom plan inserted within the pipe and fixed in the view of the moving knife. Fig. 5 is a plan proper positions there shall be a slot between View of the surface of the bed-dies. Fig. 6is their ends directly above the slot 0 and of the S 5 afrontview of a piece of pipe which has same shape. (See Fig.1.) The mandrels are been cut by the apparatus shown in Fig. 1. arranged end to end horizontally and are sup- Figs. 7, 8, and 9 are plan views of severals ported by fixed frames or heads g g, through forms of mandrel adapted for use in cutting which they pass. They are prevented from pipe on lines at different angles to its axis. rotation within these heads by means of 0 Fig. 10 is a vertical sectional view of a modifeathers on the inner heads g, fitting within fied form of knife. sunken keyways k on the mandrels.

Like symbols of reference indicate like 70 are the collars, which are adjustably set parts in each. on the mandrels by set-screws i, so that when The bed die or knife is shown in Fig. 5. the mandrels are moved lengthwise in the 5 It preferably comprises two parts a and 1), heads until the collars abut against the frames which are arranged beside each other, with g the ends of the mandrels shall be in the their cutting-edges separated so as to afford proper positions and distance from each other an intermediate slot 0 for the passage of the to register with the slot 0, before described.

moving knife. The purpose of making the The operation is as follows: The pipe to be out is laid upon the bed-die, and the mandrels f f are pushed forward within the ends of the pipe until the collars h engage the heads g. The pipe is now supported on the under side by the bed-die and on the inside by the mandrels ff. When the moving knife is put in motion, it cuts through the pipe, cutting the upper side in conjunction with the mandrels, whose separated ends act as supports and as stationary cutters, and cutting the under side in conjunction with the beddie. The knife passes through the space between themandrels and through the slot 0, and its effect is to punch from the pipe a narrow annular strip at the angle of the knife. The cut produced is clean and regular, the pipe being prevented from breaking in by reason of the supporting-mandrels and beddie. After this operation the cut sections of the pipe may be removed by retracting the mandrels ff.

The shape of the knife and mandrels shown in Fig. 1 is such as to give the pipe-sections the peculiarly-beveled ends shown in Fig. 6, the knife d being for this purpose hooked outwardly at its ends, so as to blunt both ends of the out. Sections of pipe cut in this way are designedto be swaged into conical form for use as axle skeins or thimbles, the obliquely-cut ends being the lips by which the skeins are attached to the axles. The apparatus may be adapted to cut pipe atany angle if the angles of the moving knife and of the mandrel ends and bed-knives besuit-ably altered. Thus in Fig. 8 the mandrels are shown adapted for cutting pipe at right angles to its length, and in Fig. 9 the angle of the out is somewhat oblique.

I have shown and described the use of two mandrels f and f, the purpose of which is to permit of cutting the pipe in the middle into sections Without breaking. or crushing the metal on either side of the cut; but in cases where the apparatus is used simply for trimming 01f the ends of pipe only one mandrel The knife is provided at its base with a beveled point or edge at, which is preferably not coextensive with the blade. This edge will enter the pipe first, and will make a preliminary cut, so as to diverge the mandrels if they should be too close together and to clear the way for the entrance of the body of the knife.

I do not limit myself to any specific means for operating the tools which form part of my invention. Theknife may be actuated either by steam or hand power.

I claim 1. In a pipe-cutting machine, the combination of a mandrel arranged to fit within the pipe so as to support the same, a bed-die for supporting the pipe, and a knife arranged to out the pipe at the end of the point of support, substantially as and for the purposes specified.

2. In a pipe-cutting machine, the combination of a parted mandrel arranged to fit within the pipe so as to support the same, and a knife arranged to cut the pipe between the separated sections of the mandrel, substantially as and for the purposes described.

3. In a pipe-cut ing machine, a parted mandrel arranged to fit within the pipe with its sections somewhat separated, so as to afford a cuttingspace, substantially as and for the purposes described.

4. In a pipe-cutting machine, the combination of a parted mandrel arranged to fit within the pipe so as to support the same, a slotted bed-die underlying the pipe, and a moving knife arranged to out between the separated ends of the mandrel and through the slot of the bed-die, substantially as and for the purposes specified.

5. In a pipe-cuttirig-machine, the oblique cutting-knife d, having -curved or hooked outer ends, substantially as and for the purposes described.

6. The knife (Z, having a pointed edge d,

substantially as and for the purposes described.

In testimony whereof I have hereunto set my hand this 13th day of October, A. D. 1886.

CYRUS M. OARNAHAN. Witnesses:

W. B. CoRwIN, THOMAS W. BAKEWELL. 

